Welcome, and sorry...
This is a .44 Magnum, or more likely a model 29 made after this model was assigned a number. It has been refinished, and unfortunately the legal serial number (a letter S or N followed by up to six digits) has been removed from the bottom of the grip frame, and possibly also from the frame just behind the ejector rod housing in photo 5. Alteration of the legal SN on any gun is a Federal offense with heavy penalties, making the gun illegal to possess.
Your best option is probably to take all the parts off and keep them, leaving the bare frame, and turning that into your local BATFE office for disposal, along with an explanation of how you didn't know how it got to its current state. Others here may have another opinion. Good luck in your decision.